| /* |
| * NET An implementation of the SOCKET network access protocol. |
| * |
| * Version: @(#)socket.c 1.1.93 18/02/95 |
| * |
| * Authors: Orest Zborowski, <obz@Kodak.COM> |
| * Ross Biro, <bir7@leland.Stanford.Edu> |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Fixes: |
| * Anonymous : NOTSOCK/BADF cleanup. Error fix in |
| * shutdown() |
| * Alan Cox : verify_area() fixes |
| * Alan Cox : Removed DDI |
| * Jonathan Kamens : SOCK_DGRAM reconnect bug |
| * Alan Cox : Moved a load of checks to the very |
| * top level. |
| * Alan Cox : Move address structures to/from user |
| * mode above the protocol layers. |
| * Rob Janssen : Allow 0 length sends. |
| * Alan Cox : Asynchronous I/O support (cribbed from the |
| * tty drivers). |
| * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) |
| * Jeff Uphoff : Made max number of sockets command-line |
| * configurable. |
| * Matti Aarnio : Made the number of sockets dynamic, |
| * to be allocated when needed, and mr. |
| * Uphoff's max is used as max to be |
| * allowed to allocate. |
| * Linus : Argh. removed all the socket allocation |
| * altogether: it's in the inode now. |
| * Alan Cox : Made sock_alloc()/sock_release() public |
| * for NetROM and future kernel nfsd type |
| * stuff. |
| * Alan Cox : sendmsg/recvmsg basics. |
| * Tom Dyas : Export net symbols. |
| * Marcin Dalecki : Fixed problems with CONFIG_NET="n". |
| * Alan Cox : Added thread locking to sys_* calls |
| * for sockets. May have errors at the |
| * moment. |
| * Kevin Buhr : Fixed the dumb errors in the above. |
| * Andi Kleen : Some small cleanups, optimizations, |
| * and fixed a copy_from_user() bug. |
| * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) |
| * Tigran Aivazian : Made listen(2) backlog sanity checks |
| * protocol-independent |
| * |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * |
| * This module is effectively the top level interface to the BSD socket |
| * paradigm. |
| * |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/mm.h> |
| #include <linux/smp_lock.h> |
| #include <linux/socket.h> |
| #include <linux/file.h> |
| #include <linux/net.h> |
| #include <linux/interrupt.h> |
| #include <linux/netdevice.h> |
| #include <linux/proc_fs.h> |
| #include <linux/wanrouter.h> |
| #include <linux/netlink.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/init.h> |
| #include <linux/poll.h> |
| #include <linux/cache.h> |
| #include <linux/module.h> |
| #include <linux/highmem.h> |
| |
| #if defined(CONFIG_KMOD) && defined(CONFIG_NET) |
| #include <linux/kmod.h> |
| #endif |
| |
| #include <asm/uaccess.h> |
| |
| #include <net/sock.h> |
| #include <net/scm.h> |
| #include <linux/netfilter.h> |
| |
| static int sock_no_open(struct inode *irrelevant, struct file *dontcare); |
| static ssize_t sock_read(struct file *file, char *buf, |
| size_t size, loff_t *ppos); |
| static ssize_t sock_write(struct file *file, const char *buf, |
| size_t size, loff_t *ppos); |
| static int sock_mmap(struct file *file, struct vm_area_struct * vma); |
| |
| static int sock_close(struct inode *inode, struct file *file); |
| static unsigned int sock_poll(struct file *file, |
| struct poll_table_struct *wait); |
| static int sock_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg); |
| static int sock_fasync(int fd, struct file *filp, int on); |
| static ssize_t sock_readv(struct file *file, const struct iovec *vector, |
| unsigned long count, loff_t *ppos); |
| static ssize_t sock_writev(struct file *file, const struct iovec *vector, |
| unsigned long count, loff_t *ppos); |
| static ssize_t sock_sendpage(struct file *file, struct page *page, |
| int offset, size_t size, loff_t *ppos, int more); |
| |
| |
| /* |
| * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
| * in the operation structures but are done directly via the socketcall() multiplexor. |
| */ |
| |
| static struct file_operations socket_file_ops = { |
| llseek: no_llseek, |
| read: sock_read, |
| write: sock_write, |
| poll: sock_poll, |
| ioctl: sock_ioctl, |
| mmap: sock_mmap, |
| open: sock_no_open, /* special open code to disallow open via /proc */ |
| release: sock_close, |
| fasync: sock_fasync, |
| readv: sock_readv, |
| writev: sock_writev, |
| sendpage: sock_sendpage |
| }; |
| |
| /* |
| * The protocol list. Each protocol is registered in here. |
| */ |
| |
| static struct net_proto_family *net_families[NPROTO]; |
| |
| #ifdef CONFIG_SMP |
| static atomic_t net_family_lockct = ATOMIC_INIT(0); |
| static spinlock_t net_family_lock = SPIN_LOCK_UNLOCKED; |
| |
| /* The strategy is: modifications net_family vector are short, do not |
| sleep and veeery rare, but read access should be free of any exclusive |
| locks. |
| */ |
| |
| static void net_family_write_lock(void) |
| { |
| spin_lock(&net_family_lock); |
| while (atomic_read(&net_family_lockct) != 0) { |
| spin_unlock(&net_family_lock); |
| |
| yield(); |
| |
| spin_lock(&net_family_lock); |
| } |
| } |
| |
| static __inline__ void net_family_write_unlock(void) |
| { |
| spin_unlock(&net_family_lock); |
| } |
| |
| static __inline__ void net_family_read_lock(void) |
| { |
| atomic_inc(&net_family_lockct); |
| spin_unlock_wait(&net_family_lock); |
| } |
| |
| static __inline__ void net_family_read_unlock(void) |
| { |
| atomic_dec(&net_family_lockct); |
| } |
| |
| #else |
| #define net_family_write_lock() do { } while(0) |
| #define net_family_write_unlock() do { } while(0) |
| #define net_family_read_lock() do { } while(0) |
| #define net_family_read_unlock() do { } while(0) |
| #endif |
| |
| |
| /* |
| * Statistics counters of the socket lists |
| */ |
| |
| static union { |
| int counter; |
| char __pad[SMP_CACHE_BYTES]; |
| } sockets_in_use[NR_CPUS] __cacheline_aligned = {{0}}; |
| |
| /* |
| * Support routines. Move socket addresses back and forth across the kernel/user |
| * divide and look after the messy bits. |
| */ |
| |
| #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
| 16 for IP, 16 for IPX, |
| 24 for IPv6, |
| about 80 for AX.25 |
| must be at least one bigger than |
| the AF_UNIX size (see net/unix/af_unix.c |
| :unix_mkname()). |
| */ |
| |
| /** |
| * move_addr_to_kernel - copy a socket address into kernel space |
| * @uaddr: Address in user space |
| * @kaddr: Address in kernel space |
| * @ulen: Length in user space |
| * |
| * The address is copied into kernel space. If the provided address is |
| * too long an error code of -EINVAL is returned. If the copy gives |
| * invalid addresses -EFAULT is returned. On a success 0 is returned. |
| */ |
| |
| int move_addr_to_kernel(void *uaddr, int ulen, void *kaddr) |
| { |
| if(ulen<0||ulen>MAX_SOCK_ADDR) |
| return -EINVAL; |
| if(ulen==0) |
| return 0; |
| if(copy_from_user(kaddr,uaddr,ulen)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /** |
| * move_addr_to_user - copy an address to user space |
| * @kaddr: kernel space address |
| * @klen: length of address in kernel |
| * @uaddr: user space address |
| * @ulen: pointer to user length field |
| * |
| * The value pointed to by ulen on entry is the buffer length available. |
| * This is overwritten with the buffer space used. -EINVAL is returned |
| * if an overlong buffer is specified or a negative buffer size. -EFAULT |
| * is returned if either the buffer or the length field are not |
| * accessible. |
| * After copying the data up to the limit the user specifies, the true |
| * length of the data is written over the length limit the user |
| * specified. Zero is returned for a success. |
| */ |
| |
| int move_addr_to_user(void *kaddr, int klen, void *uaddr, int *ulen) |
| { |
| int err; |
| int len; |
| |
| if((err=get_user(len, ulen))) |
| return err; |
| if(len>klen) |
| len=klen; |
| if(len<0 || len> MAX_SOCK_ADDR) |
| return -EINVAL; |
| if(len) |
| { |
| if(copy_to_user(uaddr,kaddr,len)) |
| return -EFAULT; |
| } |
| /* |
| * "fromlen shall refer to the value before truncation.." |
| * 1003.1g |
| */ |
| return __put_user(klen, ulen); |
| } |
| |
| #define SOCKFS_MAGIC 0x534F434B |
| static int sockfs_statfs(struct super_block *sb, struct statfs *buf) |
| { |
| buf->f_type = SOCKFS_MAGIC; |
| buf->f_bsize = 1024; |
| buf->f_namelen = 255; |
| return 0; |
| } |
| |
| static struct super_operations sockfs_ops = { |
| statfs: sockfs_statfs, |
| }; |
| |
| static struct super_block * sockfs_read_super(struct super_block *sb, void *data, int silent) |
| { |
| struct inode *root = new_inode(sb); |
| if (!root) |
| return NULL; |
| root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR; |
| root->i_uid = root->i_gid = 0; |
| root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME; |
| sb->s_blocksize = 1024; |
| sb->s_blocksize_bits = 10; |
| sb->s_magic = SOCKFS_MAGIC; |
| sb->s_op = &sockfs_ops; |
| sb->s_root = d_alloc(NULL, &(const struct qstr) { "socket:", 7, 0 }); |
| if (!sb->s_root) { |
| iput(root); |
| return NULL; |
| } |
| sb->s_root->d_sb = sb; |
| sb->s_root->d_parent = sb->s_root; |
| d_instantiate(sb->s_root, root); |
| return sb; |
| } |
| |
| static struct vfsmount *sock_mnt; |
| static DECLARE_FSTYPE(sock_fs_type, "sockfs", sockfs_read_super, FS_NOMOUNT); |
| static int sockfs_delete_dentry(struct dentry *dentry) |
| { |
| return 1; |
| } |
| static struct dentry_operations sockfs_dentry_operations = { |
| d_delete: sockfs_delete_dentry, |
| }; |
| |
| /* |
| * Obtains the first available file descriptor and sets it up for use. |
| * |
| * This function creates file structure and maps it to fd space |
| * of current process. On success it returns file descriptor |
| * and file struct implicitly stored in sock->file. |
| * Note that another thread may close file descriptor before we return |
| * from this function. We use the fact that now we do not refer |
| * to socket after mapping. If one day we will need it, this |
| * function will increment ref. count on file by 1. |
| * |
| * In any case returned fd MAY BE not valid! |
| * This race condition is unavoidable |
| * with shared fd spaces, we cannot solve it inside kernel, |
| * but we take care of internal coherence yet. |
| */ |
| |
| int sock_map_fd(struct socket *sock) |
| { |
| int fd; |
| struct qstr this; |
| char name[32]; |
| |
| /* |
| * Find a file descriptor suitable for return to the user. |
| */ |
| |
| fd = get_unused_fd(); |
| if (fd >= 0) { |
| struct file *file = get_empty_filp(); |
| |
| if (!file) { |
| put_unused_fd(fd); |
| fd = -ENFILE; |
| goto out; |
| } |
| |
| sprintf(name, "[%lu]", sock->inode->i_ino); |
| this.name = name; |
| this.len = strlen(name); |
| this.hash = sock->inode->i_ino; |
| |
| file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); |
| if (!file->f_dentry) { |
| put_filp(file); |
| put_unused_fd(fd); |
| fd = -ENOMEM; |
| goto out; |
| } |
| file->f_dentry->d_op = &sockfs_dentry_operations; |
| d_add(file->f_dentry, sock->inode); |
| file->f_vfsmnt = mntget(sock_mnt); |
| |
| sock->file = file; |
| file->f_op = sock->inode->i_fop = &socket_file_ops; |
| file->f_mode = 3; |
| file->f_flags = O_RDWR; |
| file->f_pos = 0; |
| fd_install(fd, file); |
| } |
| |
| out: |
| return fd; |
| } |
| |
| extern __inline__ struct socket *socki_lookup(struct inode *inode) |
| { |
| return &inode->u.socket_i; |
| } |
| |
| /** |
| * sockfd_lookup - Go from a file number to its socket slot |
| * @fd: file handle |
| * @err: pointer to an error code return |
| * |
| * The file handle passed in is locked and the socket it is bound |
| * too is returned. If an error occurs the err pointer is overwritten |
| * with a negative errno code and NULL is returned. The function checks |
| * for both invalid handles and passing a handle which is not a socket. |
| * |
| * On a success the socket object pointer is returned. |
| */ |
| |
| struct socket *sockfd_lookup(int fd, int *err) |
| { |
| struct file *file; |
| struct inode *inode; |
| struct socket *sock; |
| |
| if (!(file = fget(fd))) |
| { |
| *err = -EBADF; |
| return NULL; |
| } |
| |
| inode = file->f_dentry->d_inode; |
| if (!inode->i_sock || !(sock = socki_lookup(inode))) |
| { |
| *err = -ENOTSOCK; |
| fput(file); |
| return NULL; |
| } |
| |
| if (sock->file != file) { |
| printk(KERN_ERR "socki_lookup: socket file changed!\n"); |
| sock->file = file; |
| } |
| return sock; |
| } |
| |
| extern __inline__ void sockfd_put(struct socket *sock) |
| { |
| fput(sock->file); |
| } |
| |
| /** |
| * sock_alloc - allocate a socket |
| * |
| * Allocate a new inode and socket object. The two are bound together |
| * and initialised. The socket is then returned. If we are out of inodes |
| * NULL is returned. |
| */ |
| |
| struct socket *sock_alloc(void) |
| { |
| struct inode * inode; |
| struct socket * sock; |
| |
| inode = new_inode(sock_mnt->mnt_sb); |
| if (!inode) |
| return NULL; |
| |
| inode->i_dev = NODEV; |
| sock = socki_lookup(inode); |
| |
| inode->i_mode = S_IFSOCK|S_IRWXUGO; |
| inode->i_sock = 1; |
| inode->i_uid = current->fsuid; |
| inode->i_gid = current->fsgid; |
| |
| sock->inode = inode; |
| init_waitqueue_head(&sock->wait); |
| sock->fasync_list = NULL; |
| sock->state = SS_UNCONNECTED; |
| sock->flags = 0; |
| sock->ops = NULL; |
| sock->sk = NULL; |
| sock->file = NULL; |
| |
| sockets_in_use[smp_processor_id()].counter++; |
| return sock; |
| } |
| |
| /* |
| * In theory you can't get an open on this inode, but /proc provides |
| * a back door. Remember to keep it shut otherwise you'll let the |
| * creepy crawlies in. |
| */ |
| |
| static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
| { |
| return -ENXIO; |
| } |
| |
| /** |
| * sock_release - close a socket |
| * @sock: socket to close |
| * |
| * The socket is released from the protocol stack if it has a release |
| * callback, and the inode is then released if the socket is bound to |
| * an inode not a file. |
| */ |
| |
| void sock_release(struct socket *sock) |
| { |
| if (sock->ops) |
| sock->ops->release(sock); |
| |
| if (sock->fasync_list) |
| printk(KERN_ERR "sock_release: fasync list not empty!\n"); |
| |
| sockets_in_use[smp_processor_id()].counter--; |
| if (!sock->file) { |
| iput(sock->inode); |
| return; |
| } |
| sock->file=NULL; |
| } |
| |
| int sock_sendmsg(struct socket *sock, struct msghdr *msg, int size) |
| { |
| int err; |
| struct scm_cookie scm; |
| |
| err = scm_send(sock, msg, &scm); |
| if (err >= 0) { |
| err = sock->ops->sendmsg(sock, msg, size, &scm); |
| scm_destroy(&scm); |
| } |
| return err; |
| } |
| |
| int sock_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags) |
| { |
| struct scm_cookie scm; |
| |
| memset(&scm, 0, sizeof(scm)); |
| |
| size = sock->ops->recvmsg(sock, msg, size, flags, &scm); |
| if (size >= 0) |
| scm_recv(sock, msg, &scm, flags); |
| |
| return size; |
| } |
| |
| |
| /* |
| * Read data from a socket. ubuf is a user mode pointer. We make sure the user |
| * area ubuf...ubuf+size-1 is writable before asking the protocol. |
| */ |
| |
| static ssize_t sock_read(struct file *file, char *ubuf, |
| size_t size, loff_t *ppos) |
| { |
| struct socket *sock; |
| struct iovec iov; |
| struct msghdr msg; |
| int flags; |
| |
| if (ppos != &file->f_pos) |
| return -ESPIPE; |
| if (size==0) /* Match SYS5 behaviour */ |
| return 0; |
| |
| sock = socki_lookup(file->f_dentry->d_inode); |
| |
| msg.msg_name=NULL; |
| msg.msg_namelen=0; |
| msg.msg_iov=&iov; |
| msg.msg_iovlen=1; |
| msg.msg_control=NULL; |
| msg.msg_controllen=0; |
| iov.iov_base=ubuf; |
| iov.iov_len=size; |
| flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
| |
| return sock_recvmsg(sock, &msg, size, flags); |
| } |
| |
| |
| /* |
| * Write data to a socket. We verify that the user area ubuf..ubuf+size-1 |
| * is readable by the user process. |
| */ |
| |
| static ssize_t sock_write(struct file *file, const char *ubuf, |
| size_t size, loff_t *ppos) |
| { |
| struct socket *sock; |
| struct msghdr msg; |
| struct iovec iov; |
| |
| if (ppos != &file->f_pos) |
| return -ESPIPE; |
| if(size==0) /* Match SYS5 behaviour */ |
| return 0; |
| |
| sock = socki_lookup(file->f_dentry->d_inode); |
| |
| msg.msg_name=NULL; |
| msg.msg_namelen=0; |
| msg.msg_iov=&iov; |
| msg.msg_iovlen=1; |
| msg.msg_control=NULL; |
| msg.msg_controllen=0; |
| msg.msg_flags=!(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
| if (sock->type == SOCK_SEQPACKET) |
| msg.msg_flags |= MSG_EOR; |
| iov.iov_base=(void *)ubuf; |
| iov.iov_len=size; |
| |
| return sock_sendmsg(sock, &msg, size); |
| } |
| |
| ssize_t sock_sendpage(struct file *file, struct page *page, |
| int offset, size_t size, loff_t *ppos, int more) |
| { |
| struct socket *sock; |
| int flags; |
| |
| if (ppos != &file->f_pos) |
| return -ESPIPE; |
| |
| sock = socki_lookup(file->f_dentry->d_inode); |
| |
| flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
| if (more) |
| flags |= MSG_MORE; |
| |
| if (!sock->ops->sendpage) |
| return sock_no_sendpage(sock, page, offset, size, flags); |
| |
| return sock->ops->sendpage(sock, page, offset, size, flags); |
| } |
| |
| int sock_readv_writev(int type, struct inode * inode, struct file * file, |
| const struct iovec * iov, long count, long size) |
| { |
| struct msghdr msg; |
| struct socket *sock; |
| |
| sock = socki_lookup(inode); |
| |
| msg.msg_name = NULL; |
| msg.msg_namelen = 0; |
| msg.msg_control = NULL; |
| msg.msg_controllen = 0; |
| msg.msg_iov = (struct iovec *) iov; |
| msg.msg_iovlen = count; |
| msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
| |
| /* read() does a VERIFY_WRITE */ |
| if (type == VERIFY_WRITE) |
| return sock_recvmsg(sock, &msg, size, msg.msg_flags); |
| |
| if (sock->type == SOCK_SEQPACKET) |
| msg.msg_flags |= MSG_EOR; |
| |
| return sock_sendmsg(sock, &msg, size); |
| } |
| |
| static ssize_t sock_readv(struct file *file, const struct iovec *vector, |
| unsigned long count, loff_t *ppos) |
| { |
| size_t tot_len = 0; |
| int i; |
| for (i = 0 ; i < count ; i++) |
| tot_len += vector[i].iov_len; |
| return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode, |
| file, vector, count, tot_len); |
| } |
| |
| static ssize_t sock_writev(struct file *file, const struct iovec *vector, |
| unsigned long count, loff_t *ppos) |
| { |
| size_t tot_len = 0; |
| int i; |
| for (i = 0 ; i < count ; i++) |
| tot_len += vector[i].iov_len; |
| return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode, |
| file, vector, count, tot_len); |
| } |
| |
| /* |
| * With an ioctl arg may well be a user mode pointer, but we don't know what to do |
| * with it - that's up to the protocol still. |
| */ |
| |
| int sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct socket *sock; |
| int err; |
| |
| unlock_kernel(); |
| sock = socki_lookup(inode); |
| err = sock->ops->ioctl(sock, cmd, arg); |
| lock_kernel(); |
| |
| return err; |
| } |
| |
| |
| /* No kernel lock held - perfect */ |
| static unsigned int sock_poll(struct file *file, poll_table * wait) |
| { |
| struct socket *sock; |
| |
| /* |
| * We can't return errors to poll, so it's either yes or no. |
| */ |
| sock = socki_lookup(file->f_dentry->d_inode); |
| return sock->ops->poll(file, sock, wait); |
| } |
| |
| static int sock_mmap(struct file * file, struct vm_area_struct * vma) |
| { |
| struct socket *sock = socki_lookup(file->f_dentry->d_inode); |
| |
| return sock->ops->mmap(file, sock, vma); |
| } |
| |
| int sock_close(struct inode *inode, struct file *filp) |
| { |
| /* |
| * It was possible the inode is NULL we were |
| * closing an unfinished socket. |
| */ |
| |
| if (!inode) |
| { |
| printk(KERN_DEBUG "sock_close: NULL inode\n"); |
| return 0; |
| } |
| sock_fasync(-1, filp, 0); |
| sock_release(socki_lookup(inode)); |
| return 0; |
| } |
| |
| /* |
| * Update the socket async list |
| * |
| * Fasync_list locking strategy. |
| * |
| * 1. fasync_list is modified only under process context socket lock |
| * i.e. under semaphore. |
| * 2. fasync_list is used under read_lock(&sk->callback_lock) |
| * or under socket lock. |
| * 3. fasync_list can be used from softirq context, so that |
| * modification under socket lock have to be enhanced with |
| * write_lock_bh(&sk->callback_lock). |
| * --ANK (990710) |
| */ |
| |
| static int sock_fasync(int fd, struct file *filp, int on) |
| { |
| struct fasync_struct *fa, *fna=NULL, **prev; |
| struct socket *sock; |
| struct sock *sk; |
| |
| if (on) |
| { |
| fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
| if(fna==NULL) |
| return -ENOMEM; |
| } |
| |
| sock = socki_lookup(filp->f_dentry->d_inode); |
| |
| if ((sk=sock->sk) == NULL) { |
| if (fna) |
| kfree(fna); |
| return -EINVAL; |
| } |
| |
| lock_sock(sk); |
| |
| prev=&(sock->fasync_list); |
| |
| for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) |
| if (fa->fa_file==filp) |
| break; |
| |
| if(on) |
| { |
| if(fa!=NULL) |
| { |
| write_lock_bh(&sk->callback_lock); |
| fa->fa_fd=fd; |
| write_unlock_bh(&sk->callback_lock); |
| |
| kfree(fna); |
| goto out; |
| } |
| fna->fa_file=filp; |
| fna->fa_fd=fd; |
| fna->magic=FASYNC_MAGIC; |
| fna->fa_next=sock->fasync_list; |
| write_lock_bh(&sk->callback_lock); |
| sock->fasync_list=fna; |
| write_unlock_bh(&sk->callback_lock); |
| } |
| else |
| { |
| if (fa!=NULL) |
| { |
| write_lock_bh(&sk->callback_lock); |
| *prev=fa->fa_next; |
| write_unlock_bh(&sk->callback_lock); |
| kfree(fa); |
| } |
| } |
| |
| out: |
| release_sock(sock->sk); |
| return 0; |
| } |
| |
| /* This function may be called only under socket lock or callback_lock */ |
| |
| int sock_wake_async(struct socket *sock, int how, int band) |
| { |
| if (!sock || !sock->fasync_list) |
| return -1; |
| switch (how) |
| { |
| case 1: |
| |
| if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
| break; |
| goto call_kill; |
| case 2: |
| if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
| break; |
| /* fall through */ |
| case 0: |
| call_kill: |
| __kill_fasync(sock->fasync_list, SIGIO, band); |
| break; |
| case 3: |
| __kill_fasync(sock->fasync_list, SIGURG, band); |
| } |
| return 0; |
| } |
| |
| |
| int sock_create(int family, int type, int protocol, struct socket **res) |
| { |
| int i; |
| struct socket *sock; |
| |
| /* |
| * Check protocol is in range |
| */ |
| if (family < 0 || family >= NPROTO) |
| return -EAFNOSUPPORT; |
| if (type < 0 || type >= SOCK_MAX) |
| return -EINVAL; |
| |
| /* Compatibility. |
| |
| This uglymoron is moved from INET layer to here to avoid |
| deadlock in module load. |
| */ |
| if (family == PF_INET && type == SOCK_PACKET) { |
| static int warned; |
| if (!warned) { |
| warned = 1; |
| printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); |
| } |
| family = PF_PACKET; |
| } |
| |
| #if defined(CONFIG_KMOD) && defined(CONFIG_NET) |
| /* Attempt to load a protocol module if the find failed. |
| * |
| * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user |
| * requested real, full-featured networking support upon configuration. |
| * Otherwise module support will break! |
| */ |
| if (net_families[family]==NULL) |
| { |
| char module_name[30]; |
| sprintf(module_name,"net-pf-%d",family); |
| request_module(module_name); |
| } |
| #endif |
| |
| net_family_read_lock(); |
| if (net_families[family] == NULL) { |
| i = -EAFNOSUPPORT; |
| goto out; |
| } |
| |
| /* |
| * Allocate the socket and allow the family to set things up. if |
| * the protocol is 0, the family is instructed to select an appropriate |
| * default. |
| */ |
| |
| if (!(sock = sock_alloc())) |
| { |
| printk(KERN_WARNING "socket: no more sockets\n"); |
| i = -ENFILE; /* Not exactly a match, but its the |
| closest posix thing */ |
| goto out; |
| } |
| |
| sock->type = type; |
| |
| if ((i = net_families[family]->create(sock, protocol)) < 0) |
| { |
| sock_release(sock); |
| goto out; |
| } |
| |
| *res = sock; |
| |
| out: |
| net_family_read_unlock(); |
| return i; |
| } |
| |
| asmlinkage long sys_socket(int family, int type, int protocol) |
| { |
| int retval; |
| struct socket *sock; |
| |
| retval = sock_create(family, type, protocol, &sock); |
| if (retval < 0) |
| goto out; |
| |
| retval = sock_map_fd(sock); |
| if (retval < 0) |
| goto out_release; |
| |
| out: |
| /* It may be already another descriptor 8) Not kernel problem. */ |
| return retval; |
| |
| out_release: |
| sock_release(sock); |
| return retval; |
| } |
| |
| /* |
| * Create a pair of connected sockets. |
| */ |
| |
| asmlinkage long sys_socketpair(int family, int type, int protocol, int usockvec[2]) |
| { |
| struct socket *sock1, *sock2; |
| int fd1, fd2, err; |
| |
| /* |
| * Obtain the first socket and check if the underlying protocol |
| * supports the socketpair call. |
| */ |
| |
| err = sock_create(family, type, protocol, &sock1); |
| if (err < 0) |
| goto out; |
| |
| err = sock_create(family, type, protocol, &sock2); |
| if (err < 0) |
| goto out_release_1; |
| |
| err = sock1->ops->socketpair(sock1, sock2); |
| if (err < 0) |
| goto out_release_both; |
| |
| fd1 = fd2 = -1; |
| |
| err = sock_map_fd(sock1); |
| if (err < 0) |
| goto out_release_both; |
| fd1 = err; |
| |
| err = sock_map_fd(sock2); |
| if (err < 0) |
| goto out_close_1; |
| fd2 = err; |
| |
| /* fd1 and fd2 may be already another descriptors. |
| * Not kernel problem. |
| */ |
| |
| err = put_user(fd1, &usockvec[0]); |
| if (!err) |
| err = put_user(fd2, &usockvec[1]); |
| if (!err) |
| return 0; |
| |
| sys_close(fd2); |
| sys_close(fd1); |
| return err; |
| |
| out_close_1: |
| sock_release(sock2); |
| sys_close(fd1); |
| return err; |
| |
| out_release_both: |
| sock_release(sock2); |
| out_release_1: |
| sock_release(sock1); |
| out: |
| return err; |
| } |
| |
| |
| /* |
| * Bind a name to a socket. Nothing much to do here since it's |
| * the protocol's responsibility to handle the local address. |
| * |
| * We move the socket address to kernel space before we call |
| * the protocol layer (having also checked the address is ok). |
| */ |
| |
| asmlinkage long sys_bind(int fd, struct sockaddr *umyaddr, int addrlen) |
| { |
| struct socket *sock; |
| char address[MAX_SOCK_ADDR]; |
| int err; |
| |
| if((sock = sockfd_lookup(fd,&err))!=NULL) |
| { |
| if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) |
| err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); |
| sockfd_put(sock); |
| } |
| return err; |
| } |
| |
| |
| /* |
| * Perform a listen. Basically, we allow the protocol to do anything |
| * necessary for a listen, and if that works, we mark the socket as |
| * ready for listening. |
| */ |
| |
| int sysctl_somaxconn = SOMAXCONN; |
| |
| asmlinkage long sys_listen(int fd, int backlog) |
| { |
| struct socket *sock; |
| int err; |
| |
| if ((sock = sockfd_lookup(fd, &err)) != NULL) { |
| if ((unsigned) backlog > sysctl_somaxconn) |
| backlog = sysctl_somaxconn; |
| err=sock->ops->listen(sock, backlog); |
| sockfd_put(sock); |
| } |
| return err; |
| } |
| |
| |
| /* |
| * For accept, we attempt to create a new socket, set up the link |
| * with the client, wake up the client, then return the new |
| * connected fd. We collect the address of the connector in kernel |
| * space and move it to user at the very end. This is unclean because |
| * we open the socket then return an error. |
| * |
| * 1003.1g adds the ability to recvmsg() to query connection pending |
| * status to recvmsg. We need to add that support in a way thats |
| * clean when we restucture accept also. |
| */ |
| |
| asmlinkage long sys_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen) |
| { |
| struct socket *sock, *newsock; |
| int err, len; |
| char address[MAX_SOCK_ADDR]; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| |
| err = -ENFILE; |
| if (!(newsock = sock_alloc())) |
| goto out_put; |
| |
| newsock->type = sock->type; |
| newsock->ops = sock->ops; |
| |
| err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
| if (err < 0) |
| goto out_release; |
| |
| if (upeer_sockaddr) { |
| if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { |
| err = -ECONNABORTED; |
| goto out_release; |
| } |
| err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); |
| if (err < 0) |
| goto out_release; |
| } |
| |
| /* File flags are not inherited via accept() unlike another OSes. */ |
| |
| if ((err = sock_map_fd(newsock)) < 0) |
| goto out_release; |
| |
| out_put: |
| sockfd_put(sock); |
| out: |
| return err; |
| |
| out_release: |
| sock_release(newsock); |
| goto out_put; |
| } |
| |
| |
| /* |
| * Attempt to connect to a socket with the server address. The address |
| * is in user space so we verify it is OK and move it to kernel space. |
| * |
| * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
| * break bindings |
| * |
| * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
| * other SEQPACKET protocols that take time to connect() as it doesn't |
| * include the -EINPROGRESS status for such sockets. |
| */ |
| |
| asmlinkage long sys_connect(int fd, struct sockaddr *uservaddr, int addrlen) |
| { |
| struct socket *sock; |
| char address[MAX_SOCK_ADDR]; |
| int err; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| err = move_addr_to_kernel(uservaddr, addrlen, address); |
| if (err < 0) |
| goto out_put; |
| err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, |
| sock->file->f_flags); |
| out_put: |
| sockfd_put(sock); |
| out: |
| return err; |
| } |
| |
| /* |
| * Get the local address ('name') of a socket object. Move the obtained |
| * name to user space. |
| */ |
| |
| asmlinkage long sys_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len) |
| { |
| struct socket *sock; |
| char address[MAX_SOCK_ADDR]; |
| int len, err; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); |
| if (err) |
| goto out_put; |
| err = move_addr_to_user(address, len, usockaddr, usockaddr_len); |
| |
| out_put: |
| sockfd_put(sock); |
| out: |
| return err; |
| } |
| |
| /* |
| * Get the remote address ('name') of a socket object. Move the obtained |
| * name to user space. |
| */ |
| |
| asmlinkage long sys_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len) |
| { |
| struct socket *sock; |
| char address[MAX_SOCK_ADDR]; |
| int len, err; |
| |
| if ((sock = sockfd_lookup(fd, &err))!=NULL) |
| { |
| err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); |
| if (!err) |
| err=move_addr_to_user(address,len, usockaddr, usockaddr_len); |
| sockfd_put(sock); |
| } |
| return err; |
| } |
| |
| /* |
| * Send a datagram to a given address. We move the address into kernel |
| * space and check the user space data area is readable before invoking |
| * the protocol. |
| */ |
| |
| asmlinkage long sys_sendto(int fd, void * buff, size_t len, unsigned flags, |
| struct sockaddr *addr, int addr_len) |
| { |
| struct socket *sock; |
| char address[MAX_SOCK_ADDR]; |
| int err; |
| struct msghdr msg; |
| struct iovec iov; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| iov.iov_base=buff; |
| iov.iov_len=len; |
| msg.msg_name=NULL; |
| msg.msg_iov=&iov; |
| msg.msg_iovlen=1; |
| msg.msg_control=NULL; |
| msg.msg_controllen=0; |
| msg.msg_namelen=0; |
| if(addr) |
| { |
| err = move_addr_to_kernel(addr, addr_len, address); |
| if (err < 0) |
| goto out_put; |
| msg.msg_name=address; |
| msg.msg_namelen=addr_len; |
| } |
| if (sock->file->f_flags & O_NONBLOCK) |
| flags |= MSG_DONTWAIT; |
| msg.msg_flags = flags; |
| err = sock_sendmsg(sock, &msg, len); |
| |
| out_put: |
| sockfd_put(sock); |
| out: |
| return err; |
| } |
| |
| /* |
| * Send a datagram down a socket. |
| */ |
| |
| asmlinkage long sys_send(int fd, void * buff, size_t len, unsigned flags) |
| { |
| return sys_sendto(fd, buff, len, flags, NULL, 0); |
| } |
| |
| /* |
| * Receive a frame from the socket and optionally record the address of the |
| * sender. We verify the buffers are writable and if needed move the |
| * sender address from kernel to user space. |
| */ |
| |
| asmlinkage long sys_recvfrom(int fd, void * ubuf, size_t size, unsigned flags, |
| struct sockaddr *addr, int *addr_len) |
| { |
| struct socket *sock; |
| struct iovec iov; |
| struct msghdr msg; |
| char address[MAX_SOCK_ADDR]; |
| int err,err2; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| |
| msg.msg_control=NULL; |
| msg.msg_controllen=0; |
| msg.msg_iovlen=1; |
| msg.msg_iov=&iov; |
| iov.iov_len=size; |
| iov.iov_base=ubuf; |
| msg.msg_name=address; |
| msg.msg_namelen=MAX_SOCK_ADDR; |
| if (sock->file->f_flags & O_NONBLOCK) |
| flags |= MSG_DONTWAIT; |
| err=sock_recvmsg(sock, &msg, size, flags); |
| |
| if(err >= 0 && addr != NULL) |
| { |
| err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); |
| if(err2<0) |
| err=err2; |
| } |
| sockfd_put(sock); |
| out: |
| return err; |
| } |
| |
| /* |
| * Receive a datagram from a socket. |
| */ |
| |
| asmlinkage long sys_recv(int fd, void * ubuf, size_t size, unsigned flags) |
| { |
| return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
| } |
| |
| /* |
| * Set a socket option. Because we don't know the option lengths we have |
| * to pass the user mode parameter for the protocols to sort out. |
| */ |
| |
| asmlinkage long sys_setsockopt(int fd, int level, int optname, char *optval, int optlen) |
| { |
| int err; |
| struct socket *sock; |
| |
| if (optlen < 0) |
| return -EINVAL; |
| |
| if ((sock = sockfd_lookup(fd, &err))!=NULL) |
| { |
| if (level == SOL_SOCKET) |
| err=sock_setsockopt(sock,level,optname,optval,optlen); |
| else |
| err=sock->ops->setsockopt(sock, level, optname, optval, optlen); |
| sockfd_put(sock); |
| } |
| return err; |
| } |
| |
| /* |
| * Get a socket option. Because we don't know the option lengths we have |
| * to pass a user mode parameter for the protocols to sort out. |
| */ |
| |
| asmlinkage long sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen) |
| { |
| int err; |
| struct socket *sock; |
| |
| if ((sock = sockfd_lookup(fd, &err))!=NULL) |
| { |
| if (level == SOL_SOCKET) |
| err=sock_getsockopt(sock,level,optname,optval,optlen); |
| else |
| err=sock->ops->getsockopt(sock, level, optname, optval, optlen); |
| sockfd_put(sock); |
| } |
| return err; |
| } |
| |
| |
| /* |
| * Shutdown a socket. |
| */ |
| |
| asmlinkage long sys_shutdown(int fd, int how) |
| { |
| int err; |
| struct socket *sock; |
| |
| if ((sock = sockfd_lookup(fd, &err))!=NULL) |
| { |
| err=sock->ops->shutdown(sock, how); |
| sockfd_put(sock); |
| } |
| return err; |
| } |
| |
| /* |
| * BSD sendmsg interface |
| */ |
| |
| asmlinkage long sys_sendmsg(int fd, struct msghdr *msg, unsigned flags) |
| { |
| struct socket *sock; |
| char address[MAX_SOCK_ADDR]; |
| struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
| unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */ |
| unsigned char *ctl_buf = ctl; |
| struct msghdr msg_sys; |
| int err, ctl_len, iov_size, total_len; |
| |
| err = -EFAULT; |
| if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) |
| goto out; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| |
| /* do not move before msg_sys is valid */ |
| err = -EMSGSIZE; |
| if (msg_sys.msg_iovlen > UIO_MAXIOV) |
| goto out_put; |
| |
| /* Check whether to allocate the iovec area*/ |
| err = -ENOMEM; |
| iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
| if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
| iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
| if (!iov) |
| goto out_put; |
| } |
| |
| /* This will also move the address data into kernel space */ |
| err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); |
| if (err < 0) |
| goto out_freeiov; |
| total_len = err; |
| |
| err = -ENOBUFS; |
| |
| if (msg_sys.msg_controllen > INT_MAX) |
| goto out_freeiov; |
| ctl_len = msg_sys.msg_controllen; |
| if (ctl_len) |
| { |
| if (ctl_len > sizeof(ctl)) |
| { |
| ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
| if (ctl_buf == NULL) |
| goto out_freeiov; |
| } |
| err = -EFAULT; |
| if (copy_from_user(ctl_buf, msg_sys.msg_control, ctl_len)) |
| goto out_freectl; |
| msg_sys.msg_control = ctl_buf; |
| } |
| msg_sys.msg_flags = flags; |
| |
| if (sock->file->f_flags & O_NONBLOCK) |
| msg_sys.msg_flags |= MSG_DONTWAIT; |
| err = sock_sendmsg(sock, &msg_sys, total_len); |
| |
| out_freectl: |
| if (ctl_buf != ctl) |
| sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
| out_freeiov: |
| if (iov != iovstack) |
| sock_kfree_s(sock->sk, iov, iov_size); |
| out_put: |
| sockfd_put(sock); |
| out: |
| return err; |
| } |
| |
| /* |
| * BSD recvmsg interface |
| */ |
| |
| asmlinkage long sys_recvmsg(int fd, struct msghdr *msg, unsigned int flags) |
| { |
| struct socket *sock; |
| struct iovec iovstack[UIO_FASTIOV]; |
| struct iovec *iov=iovstack; |
| struct msghdr msg_sys; |
| unsigned long cmsg_ptr; |
| int err, iov_size, total_len, len; |
| |
| /* kernel mode address */ |
| char addr[MAX_SOCK_ADDR]; |
| |
| /* user mode address pointers */ |
| struct sockaddr *uaddr; |
| int *uaddr_len; |
| |
| err=-EFAULT; |
| if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) |
| goto out; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| goto out; |
| |
| err = -EMSGSIZE; |
| if (msg_sys.msg_iovlen > UIO_MAXIOV) |
| goto out_put; |
| |
| /* Check whether to allocate the iovec area*/ |
| err = -ENOMEM; |
| iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
| if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
| iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
| if (!iov) |
| goto out_put; |
| } |
| |
| /* |
| * Save the user-mode address (verify_iovec will change the |
| * kernel msghdr to use the kernel address space) |
| */ |
| |
| uaddr = msg_sys.msg_name; |
| uaddr_len = &msg->msg_namelen; |
| err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
| if (err < 0) |
| goto out_freeiov; |
| total_len=err; |
| |
| cmsg_ptr = (unsigned long)msg_sys.msg_control; |
| msg_sys.msg_flags = 0; |
| |
| if (sock->file->f_flags & O_NONBLOCK) |
| flags |= MSG_DONTWAIT; |
| err = sock_recvmsg(sock, &msg_sys, total_len, flags); |
| if (err < 0) |
| goto out_freeiov; |
| len = err; |
| |
| if (uaddr != NULL) { |
| err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); |
| if (err < 0) |
| goto out_freeiov; |
| } |
| err = __put_user(msg_sys.msg_flags, &msg->msg_flags); |
| if (err) |
| goto out_freeiov; |
| err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, |
| &msg->msg_controllen); |
| if (err) |
| goto out_freeiov; |
| err = len; |
| |
| out_freeiov: |
| if (iov != iovstack) |
| sock_kfree_s(sock->sk, iov, iov_size); |
| out_put: |
| sockfd_put(sock); |
| out: |
| return err; |
| } |
| |
| |
| /* |
| * Perform a file control on a socket file descriptor. |
| * |
| * Doesn't acquire a fd lock, because no network fcntl |
| * function sleeps currently. |
| */ |
| |
| int sock_fcntl(struct file *filp, unsigned int cmd, unsigned long arg) |
| { |
| struct socket *sock; |
| |
| sock = socki_lookup (filp->f_dentry->d_inode); |
| if (sock && sock->ops) |
| return sock_no_fcntl(sock, cmd, arg); |
| return(-EINVAL); |
| } |
| |
| /* Argument list sizes for sys_socketcall */ |
| #define AL(x) ((x) * sizeof(unsigned long)) |
| static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), |
| AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), |
| AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; |
| #undef AL |
| |
| /* |
| * System call vectors. |
| * |
| * Argument checking cleaned up. Saved 20% in size. |
| * This function doesn't need to set the kernel lock because |
| * it is set by the callees. |
| */ |
| |
| asmlinkage long sys_socketcall(int call, unsigned long *args) |
| { |
| unsigned long a[6]; |
| unsigned long a0,a1; |
| int err; |
| |
| if(call<1||call>SYS_RECVMSG) |
| return -EINVAL; |
| |
| /* copy_from_user should be SMP safe. */ |
| if (copy_from_user(a, args, nargs[call])) |
| return -EFAULT; |
| |
| a0=a[0]; |
| a1=a[1]; |
| |
| switch(call) |
| { |
| case SYS_SOCKET: |
| err = sys_socket(a0,a1,a[2]); |
| break; |
| case SYS_BIND: |
| err = sys_bind(a0,(struct sockaddr *)a1, a[2]); |
| break; |
| case SYS_CONNECT: |
| err = sys_connect(a0, (struct sockaddr *)a1, a[2]); |
| break; |
| case SYS_LISTEN: |
| err = sys_listen(a0,a1); |
| break; |
| case SYS_ACCEPT: |
| err = sys_accept(a0,(struct sockaddr *)a1, (int *)a[2]); |
| break; |
| case SYS_GETSOCKNAME: |
| err = sys_getsockname(a0,(struct sockaddr *)a1, (int *)a[2]); |
| break; |
| case SYS_GETPEERNAME: |
| err = sys_getpeername(a0, (struct sockaddr *)a1, (int *)a[2]); |
| break; |
| case SYS_SOCKETPAIR: |
| err = sys_socketpair(a0,a1, a[2], (int *)a[3]); |
| break; |
| case SYS_SEND: |
| err = sys_send(a0, (void *)a1, a[2], a[3]); |
| break; |
| case SYS_SENDTO: |
| err = sys_sendto(a0,(void *)a1, a[2], a[3], |
| (struct sockaddr *)a[4], a[5]); |
| break; |
| case SYS_RECV: |
| err = sys_recv(a0, (void *)a1, a[2], a[3]); |
| break; |
| case SYS_RECVFROM: |
| err = sys_recvfrom(a0, (void *)a1, a[2], a[3], |
| (struct sockaddr *)a[4], (int *)a[5]); |
| break; |
| case SYS_SHUTDOWN: |
| err = sys_shutdown(a0,a1); |
| break; |
| case SYS_SETSOCKOPT: |
| err = sys_setsockopt(a0, a1, a[2], (char *)a[3], a[4]); |
| break; |
| case SYS_GETSOCKOPT: |
| err = sys_getsockopt(a0, a1, a[2], (char *)a[3], (int *)a[4]); |
| break; |
| case SYS_SENDMSG: |
| err = sys_sendmsg(a0, (struct msghdr *) a1, a[2]); |
| break; |
| case SYS_RECVMSG: |
| err = sys_recvmsg(a0, (struct msghdr *) a1, a[2]); |
| break; |
| default: |
| err = -EINVAL; |
| break; |
| } |
| return err; |
| } |
| |
| /* |
| * This function is called by a protocol handler that wants to |
| * advertise its address family, and have it linked into the |
| * SOCKET module. |
| */ |
| |
| int sock_register(struct net_proto_family *ops) |
| { |
| int err; |
| |
| if (ops->family >= NPROTO) { |
| printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
| return -ENOBUFS; |
| } |
| net_family_write_lock(); |
| err = -EEXIST; |
| if (net_families[ops->family] == NULL) { |
| net_families[ops->family]=ops; |
| err = 0; |
| } |
| net_family_write_unlock(); |
| return err; |
| } |
| |
| /* |
| * This function is called by a protocol handler that wants to |
| * remove its address family, and have it unlinked from the |
| * SOCKET module. |
| */ |
| |
| int sock_unregister(int family) |
| { |
| if (family < 0 || family >= NPROTO) |
| return -1; |
| |
| net_family_write_lock(); |
| net_families[family]=NULL; |
| net_family_write_unlock(); |
| return 0; |
| } |
| |
| |
| extern void sk_init(void); |
| |
| #ifdef CONFIG_WAN_ROUTER |
| extern void wanrouter_init(void); |
| #endif |
| |
| #ifdef CONFIG_BLUEZ |
| extern void bluez_init(void); |
| #endif |
| |
| void __init sock_init(void) |
| { |
| int i; |
| |
| printk(KERN_INFO "Linux NET4.0 for Linux 2.4\n"); |
| printk(KERN_INFO "Based upon Swansea University Computer Society NET3.039\n"); |
| |
| /* |
| * Initialize all address (protocol) families. |
| */ |
| |
| for (i = 0; i < NPROTO; i++) |
| net_families[i] = NULL; |
| |
| /* |
| * Initialize sock SLAB cache. |
| */ |
| |
| sk_init(); |
| |
| #ifdef SLAB_SKB |
| /* |
| * Initialize skbuff SLAB cache |
| */ |
| skb_init(); |
| #endif |
| |
| /* |
| * Wan router layer. |
| */ |
| |
| #ifdef CONFIG_WAN_ROUTER |
| wanrouter_init(); |
| #endif |
| |
| /* |
| * Initialize the protocols module. |
| */ |
| |
| register_filesystem(&sock_fs_type); |
| sock_mnt = kern_mount(&sock_fs_type); |
| /* The real protocol initialization is performed when |
| * do_initcalls is run. |
| */ |
| |
| |
| /* |
| * The netlink device handler may be needed early. |
| */ |
| |
| #ifdef CONFIG_NET |
| netlink_proto_init(); |
| rtnetlink_init(); |
| #endif |
| #ifdef CONFIG_NETLINK_DEV |
| init_netlink(); |
| #endif |
| #ifdef CONFIG_NETFILTER |
| netfilter_init(); |
| #endif |
| |
| #ifdef CONFIG_BLUEZ |
| bluez_init(); |
| #endif |
| } |
| |
| int socket_get_info(char *buffer, char **start, off_t offset, int length) |
| { |
| int len, cpu; |
| int counter = 0; |
| |
| for (cpu=0; cpu<smp_num_cpus; cpu++) |
| counter += sockets_in_use[cpu_logical_map(cpu)].counter; |
| |
| /* It can be negative, by the way. 8) */ |
| if (counter < 0) |
| counter = 0; |
| |
| len = sprintf(buffer, "sockets: used %d\n", counter); |
| if (offset >= len) |
| { |
| *start = buffer; |
| return 0; |
| } |
| *start = buffer + offset; |
| len -= offset; |
| if (len > length) |
| len = length; |
| if (len < 0) |
| len = 0; |
| return len; |
| } |